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Jonathan O’Callaghan Profile
Jonathan O’Callaghan

@Astro_Jonny

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Award-winning Freelance Space Journalist. Words @NewScientist @SciAm @NYTimes @QuantaMagazine @Nature @WIRED + more. Sometimes on TV/Radio. jdaoca @gmail .com

London, UK
Joined September 2011
Don't wanna be here? Send us removal request.
@Astro_Jonny
Jonathan O’Callaghan
3 years
Behold, the first new close-up image of Jupiter's moon Ganymede in 20 years, just released from NASA's Juno spacecraft!
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Jonathan O’Callaghan
1 year
Someone declined an interview with me because they said their discovery was "too small" and not worth reporting. Which is... a bit sad.
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Jonathan O’Callaghan
6 years
One more.
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Jonathan O’Callaghan
3 years
The Reddit crows story is the feel-good news we all need right now
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Jonathan O’Callaghan
5 years
This appears to be an official news source claiming the #VikramLander is intact on the surface of the Moon.
@Madrassan_Pinky
Pinky Rajpurohit 🇮🇳
5 years
ISRO Sources confirms me that "Lander found 500m away from the actual landing spot. Seen from OHRC (Optical High Resolution Camera) image and it is intact. Trying to send commands from Bangalore control center." @ABPNews
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Jonathan O’Callaghan
2 years
I hate to alarm everyone but the JWST has imaged a galaxy that looks exactly like the JWST
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@Astro_Jonny
Jonathan O’Callaghan
3 years
@shockproofbeats Got to be this from the New York Times, printed the day after Apollo 11 launched to the Moon, 17 July 1969.
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Jonathan O’Callaghan
3 years
This ongoing fascination with "spaceflight OR save the world" continues to irk me. Blue Origin et al are business at the end of the day. Why not call for all Hollywood movie production to cease? Football to be scrapped? Royal yachts to be sold?
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Jonathan O’Callaghan
3 years
So, a small helicopter NASA is about to fly on Mars might do something pretty awesome. The blades of the helicopter might electrically charge the Martian dust, causing it to... Glow in the dark! Words by me @NewScientist and short thread (1/x)
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Jonathan O’Callaghan
2 years
JWST may have already broken the record for the earliest known galaxy in the universe. Announced today, it's called GLASS-z13, and dates back just 300m years after the Big Bang. Next up? Seeing the first galaxies to switch on. Words by me @NewScientist
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@Astro_Jonny
Jonathan O’Callaghan
4 years
Why does he speak in full and coherent sentences?
@TIME
TIME
4 years
Watch: “I pledge to be a President who seeks not to divide, but to unify; who doesn’t see red states or blue states, only sees the United States.” Joe Biden delivers a speech to the nation for the first time as President-elect
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Jonathan O’Callaghan
2 years
Big JWST story coming out tomorrow
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@Astro_Jonny
Jonathan O’Callaghan
5 years
I think it's happened, people. Voyager 2 appears to have left the Solar System, becoming the second interstellar spacecraft after Voyager 1 in August 2012. Expecting some sort of announcement from NASA tomorrow.
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Jonathan O’Callaghan
6 years
So let's take a look at that Dominic Raab chap eh. Surely can't be any worse than David D- Oh. Oh god no.
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Jonathan O’Callaghan
3 years
Such a cool image. NASA's Curiosity rover sampling the surface of Mars last week.
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@Astro_Jonny
Jonathan O’Callaghan
2 years
This is the incredible launch system NASA is currently developing to return from Mars. It's called VECTOR, and will very literally throw the rocket into the Martian sky, which will ignite in mid-air and launch to space. Wild? Yes! Read more by me @SciAm
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Jonathan O’Callaghan
4 years
I can't believe it, these days. Astronauts, so small. But they go to space. Tiny, tiny astronauts. Big space.
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Jonathan O’Callaghan
5 years
Fun fact: #Opportunity has been on Mars since January 2004, longer than Facebook (February 2004), Twitter (2006), and the iPhone (2007) have existed.
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Jonathan O’Callaghan
2 years
Per a story I'm writing, NASA's new spacesuits for the moon must be able to cope with half a liter of vomit.
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Jonathan O’Callaghan
3 years
"Your pieces of asteroid, sir" #Hayabusa2
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Jonathan O’Callaghan
2 years
Our models of the early universe get better every day
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Jonathan O’Callaghan
5 years
So, I've just had it confirmed from another ESA source that #SpaceX refused to move their #Starlink satellite when they were alerted to the risk of collision with #Aeolus , which was 1 in 1,000, ten times higher than the threshold for a collision avoidance manoeuvre. (1/5)
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Jonathan O’Callaghan
5 years
Looks like this basically confirms some earlier speculation about #VikramLander . The lander is in one piece, but is not flat on its landing legs.
@IndiaToday
IndiaToday
5 years
#Breaking "The lander is there as a single piece, not broken into pieces. It's in a tilted position," an #ISRO official associated with the mission claimed #Chandrayaan2 #VikramLander #ISROweareproudofyou #ISROSpotsVikram #IndiaWithISRO
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Jonathan O’Callaghan
7 years
This colour-changing hair dye from @_seetheunseen is pretty awesome
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@Astro_Jonny
Jonathan O’Callaghan
5 years
Space Twitter right now.
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Jonathan O’Callaghan
3 years
This is very cool. The hole blasted by China's Mars lander when it touched down on the Red Planet.
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Jonathan O’Callaghan
1 year
I told them it was cool!
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@Astro_Jonny
Jonathan O’Callaghan
5 years
Brexit Series Finale - MPs vote against no deal - EU refuses to extend Article 50 deadline - Theresa May announces vote to revoke Article 50 - MPs vote in favour - Article 50 revoked - Brexit cancelled - Life goes back to normal The End
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Jonathan O’Callaghan
4 years
SCOOP In a complete coincidence, a European and Japanese spacecraft is about to fly past Venus in a matter of weeks. And, excitingly, the team is going to try and confirm the presence of phosphine, a possible indicator of life. Words, by me, @Forbes
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Jonathan O’Callaghan
4 years
Oh my god if you zoom in it actually said "Trump" originally How, how did we elect these idiots.
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@BorisJohnson
Boris Johnson
4 years
Congratulations @JoeBiden and @KamalaHarris
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Jonathan O’Callaghan
2 months
Holy crap. Two satellites missed each other by LESS THAN 20 METERS in space earlier today according to LeoLabs
@LeoLabs_Space
LeoLabs
2 months
Too close for comfort. 😳 At ~06:30 UTC today we observed a conjunction at 608 km between two non-maneuverable spacecraft: a derelict Russian satellite and an operational NASA satellite. Miss distance = <20 meters Probability of collision = 3 to 8% at TCA
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Jonathan O’Callaghan
2 months
To put it another way, these two objects moving at 4 miles a second just missed each other by the length of a tennis court. They would have increased the total amount of debris in space by half if they had collided.
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Jonathan O’Callaghan
3 years
Very cool. First image of Mars from the UAE's @HopeMarsMission
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Jonathan O’Callaghan
3 years
The Queen should spend more time trying to repair this planet rather than preparing for her Platinum Jubilee
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@Astro_Jonny
Jonathan O’Callaghan
2 years
New JWST pic just dropped The Tarantula Nebula, 340 light-years across
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Jonathan O’Callaghan
4 years
So, a story I've been working on... The FCC may have wrongly ignored US environmental law in approving SpaceX's Starlink mega constellation (and other satellites). Were it to be sued, it would likely lose. Story below @SciAm , and thread to follow (1/)
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Jonathan O’Callaghan
3 years
Astronomers have found a giant object up to 370km across flying into our solar system. It could be a minor planet or 'mega comet', and will reach the orbit of Saturn in 2031 – close enough to send a mission to study it. Words by me @NewScientist
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@Astro_Jonny
Jonathan O’Callaghan
3 years
And Perseverance image of Ingenuity above the ground. So cool.
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Jonathan O’Callaghan
7 years
Yes, you can grow potatoes on #Mars , according to the International Potato Center (that is a real thing) @Cipotato
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Jonathan O’Callaghan
5 years
The first gravitational waves were discovered four years ago this Saturday. Time flies! Now, dozens of discoveries later, astronomers are starting to reap the rewards of what they can teach us. My latest story, for @SciAm
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@Astro_Jonny
Jonathan O’Callaghan
3 years
My regular daydream is that I become a billionaire and fund my own high-risk $500m space mission to an icy moon of the outer solar system to look for life.
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Jonathan O’Callaghan
5 years
Here's a remarkable animation of #gb00234 , which may be our second known interstellar visitor, taken by astronomer Gennady Borisov - who discovered the object. 2l/Borisov, perhaps? (source: )
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Jonathan O’Callaghan
5 years
So much misinformation being shared about the #VikramLander at the moment. For one, this image being shared is not a picture of the lander. It is the Apollo 15 lunar landing site.
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Jonathan O’Callaghan
5 years
Wow. This is footage from @UniOfSurrey showing their #RemoveDEBRIS satellite firing a harpoon at a target in Earth orbit. This technology could be used to remove space junk from orbit in future. Incredible.
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Jonathan O’Callaghan
1 year
This was absolutely one of the coolest shots
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@Astro_Jonny
Jonathan O’Callaghan
1 year
IAU issues a statement on the BlueWalker 3 satellite, now confirmed as one of the brightest objects in the night sky. “BlueWalker 3 is a big shift in the constellation satellite issue and should give us all reason to pause”
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@Astro_Jonny
Jonathan O’Callaghan
4 years
Reminder, tomorrow NASA is going to grab up to two kilograms of rocks from the surface of an asteroid. No space mission beyond the Moon has ever attempted such a large sample return before.
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Jonathan O’Callaghan
3 years
A reminder that TOMORROW (!!!) a Japanese spacecraft will return pieces of an asteroid to Earth – the biggest asteroid haul in history. In about 20 hours the spacecraft will release its capsule, which will touch down in the Australian outback at about 5.45pm UTC on 5 December.
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Jonathan O’Callaghan
4 years
Scientists just released the highest resolution images of the Sun ever taken - heralding a new "golden age" of solar research in the 2020s. Words, by me, @SciAm
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@Astro_Jonny
Jonathan O’Callaghan
2 years
Is there a way these won't destroy the night sky/make radio astronomy impossible?
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@Astro_Jonny
Jonathan O’Callaghan
6 years
This is frickin' amazing – the moment a space junk net was fired by @SurreySat 's #RemoveDEBRIS spacecraft in orbit on 16 September. This is real footage, not an animation.
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Jonathan O’Callaghan
5 years
Okay, I think we've got enough sources now to confirm @isro has an image (seems to be optical not thermal as some are reporting) of the #VikramLander on the surface of the Moon, and they are trying to make contact with it. So... are we counting that as a successful landing?
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@Astro_Jonny
Jonathan O’Callaghan
7 months
Whoa. The FCC has issued a fine on space debris for the first time to a company that didn't deorbit its satellite properly. It's a fine of $150,000 and "an admission of liability from the company". Could have fairly big implications for future space junk incidents?
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@Astro_Jonny
Jonathan O’Callaghan
4 years
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@Astro_Jonny
Jonathan O’Callaghan
1 year
@hankgreen Me neither until now!
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Jonathan O’Callaghan
2 years
JWST has imaged its first exoplanet! The world, HIP 65426 b, is a "super Jupiter" nearly 400 light-years away. This is a huge milestone for the telescope, and just the start of its transformational studies of alien worlds. Story by me @QuantaMagazine
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@Astro_Jonny
Jonathan O’Callaghan
6 years
There is a Japanese spacecraft called Hayabusa 2 ( @haya2e_jaxa ) arriving at an asteroid in the next few days. It hasn’t had a lot of love or attention yet. But this mission is FRICKING AWESOME. I’m going to tell you why. Thread (1/n)
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Jonathan O’Callaghan
1 year
Apropos of really absolutely nothing, the star Betelgeuse is the size of Jupiter's orbit around our sun
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Jonathan O’Callaghan
4 years
Hi everyone. Please meet Violet Elizabeth O'Callaghan, born yesterday, Wednesday 5 August at 6.52pm weighing a hefty 9lbs! Mum and baby (and Dad!) all doing well.
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Jonathan O’Callaghan
10 months
@awithist_ @jayforeman This makes me feel very old
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Jonathan O’Callaghan
5 years
Heartbreaking that it appears NASA's Opportunity rover has met its end. What an amazing mission - nearly 15 years active on Mars, more than 28 miles traveled, and some simply stunning images like this one. Farewell #Oppy
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Jonathan O’Callaghan
5 years
As of yet SpaceX has not responded to a request for comment on this. I'll have a story up on @Forbes soon with full quotes. (5/5)
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Jonathan O’Callaghan
4 years
Last night, two astronomers were hoping to observe stars in a pair of nearby galaxies with a telescope in Chile. Instead, they were greeted to the sight of 19 passing satellites in SpaceX's Starlink mega constellation. Story below, by me, @Forbes
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Jonathan O’Callaghan
4 years
Also, our friend's neighbour in Stockport puts a different bear display outside their house every day. This is today.
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Jonathan O’Callaghan
4 years
Yesterday, scientists announced a major discovery that raised the question: Could there be life on Venus? My latest for the @nytimes looks into the bold mission from @RocketLab that could launch as soon as 2023, years before anyone else, to find out.
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Jonathan O’Callaghan
8 months
Small request for India to stop naming every space mission "Vikram"
@IndianTechGuide
Indian Tech & Infra
8 months
🚨 Indian Space startup 'Skyroot Aerospace' from Hyderabad is planning to launch India's private orbital rocket 'Vikram 1' this year itself. @PawanKChandana
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Jonathan O’Callaghan
5 years
Quite the find at a Georgian flea market today - a Soviet press badge that is apparently from the Apollo-Soyuz Test Project in 1975. Pretty chuffed with this!
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Jonathan O’Callaghan
5 years
In case you missed it, we got some footage earlier today from Japan's second Hayabusa2 ( @haya2e_jaxa ) asteroid landing on 11 July. Yes, it's awesome.
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Jonathan O’Callaghan
5 years
Say what you like about their Moon plans, but NASA sure can do logos.
@jeff_foust
Jeff Foust
5 years
Artemis is a real program now: it has a logo just revealed on NASA TV.
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Jonathan O’Callaghan
2 years
A massive satellite being launched tomorrow could become the brightest artificial object in the sky. Built by AST SpaceMobile, the experimental satellite is nearly half the size of a tennis court, and could outshine Venus. Story by me @NewScientist
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Jonathan O’Callaghan
3 years
Sky crane 2 - Mars 0
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@Astro_Jonny
Jonathan O’Callaghan
5 years
China's Chang'e-4 mission may have discovered signs of the lunar mantle on the far side of the Moon. Which is super cool. Latest, by me, for @SciAm
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Jonathan O’Callaghan
3 years
Tonight, at 12.11am UK time, China will attempt to land a rover on Mars. If successful, it will become only the second nation after the US to operate on the Martian surface (the Soviets came close). It's a big deal, so I thought I'd lay out a few things in a little thread (1/x)
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Jonathan O’Callaghan
5 years
As to why Aeolus had to move and not Starlink, my source just said "in space there are no rules". Basically, SpaceX said they wouldn't move. So Aeolus had to move. (ESA said they were glad they knew one way or the other, however) (4/5)
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Jonathan O’Callaghan
4 years
This was so weird I had to write about it. Japanese billionaire Yusaku Maezawa wants "single women aged 20 or over" to apply to fly on a SpaceX spacecraft with him around the Moon in 2023 in a bizarre matchmaking venture. Words by me @Forbes
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@Astro_Jonny
Jonathan O’Callaghan
3 years
Had my first article in the print edition of The New York Times yesterday! Very exciting.
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Jonathan O’Callaghan
4 years
Behold, the highest-resolution video of the Sun ever taken, released today. Credit: NSO/NSF/AURA Link for more info:
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Jonathan O’Callaghan
4 years
Hey Twitter, some happier news in amongst all the doom and gloom... We have a new space fan joining our ranks! Little baby girl due in August.
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Jonathan O’Callaghan
5 years
Lift-off for @isro 's #Chandrayaan2 on its way to the Moon!
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Jonathan O’Callaghan
5 years
ESA have been pretty frustrated with SpaceX so far. There has been very little communication regarding Starlink, despite repeated attempts by ESA to contact them (this is the first email SpaceX had sent). (3/5)
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Jonathan O’Callaghan
2 years
Quick 🧵 on concerns around AST SpaceMobile's massive new satellite, BlueWalker 3, launching tomorrow. The experimental satellite will test if AST can directly beam 4G/5G from space to individual mobile phones. This requires a huge antenna, which could be extremely bright... 1/
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@Astro_Jonny
Jonathan O’Callaghan
4 years
Astronomy, meet Starlink again. This is pretty wild. Gif source:
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Jonathan O’Callaghan
2 years
"These satellites would be about 7 meters long, and the antenna would fold out to be about 5 meters on a side, or roughly 25 square meters." 😬
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Jonathan O’Callaghan
3 years
So, I'm very excited to share this today! I've been working on this for months, having first had the idea a year ago. It's a 200-year-old cosmic whodunnit, which could reveal the origins of every planet in the universe. By me @SciAm + small thread (1/)
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Jonathan O’Callaghan
5 years
SpaceX sent a short email to ESA saying they would not move their satellite. It's not clear why - they didn't mention if the satellite was active or not, apparently (ESA weren't even aware what the satellite was). (2/5)
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Jonathan O’Callaghan
7 years
My interview with @ProfBrianCox : "It's very difficult to argue with an idiot"
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Jonathan O’Callaghan
8 months
This is extremely cool. These researchers used a wok as a telescope to measure the 21cm emission from neutral hydrogen in the Milky Way.
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Jonathan O’Callaghan
5 years
We may have found another interstellar object in the Solar System - and it'll give us a greater insight into an alien solar system than ever before. My latest for @SciAm , with quotes from the discoverer Gennady Borisov.
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Jonathan O’Callaghan
2 years
In honour of Shackleton's ship Endurance being found this week, we took a trip to see the James Caird at @DulwichCollege today! This is the boat Shackleton and five of his crew travelled in from Elephant Island to South Georgia over 17 days. Pretty incredible.
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Jonathan O’Callaghan
2 years
Wowza. Chinese space station dodges SpaceX Starlink satellites, sends note to UN.
@CNSAWatcher
CNSA Watcher
2 years
🚨United Nation (Vienna) received a note verbale from Permanent Mission of China about USA #SpaceX ’s two StarLink satellites (No.1095&2305) close encounters w/ #Tiangong Space Station (CSS) on July 1 & Oct 21. No.2305 actively maneuvered with unknown strategy & orbit error. (1/2)
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Jonathan O’Callaghan
3 years
Climate change is shrinking our atmosphere. It could be a disaster for space junk. - Since 2000, our atmosphere at 400km has lost 21% of its density - If CO2 keeps rising we could lose 80% by 2100, increasing space junk levels 50x Words by me @nytimes
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Jonathan O’Callaghan
5 years
Gained about 500 followers today and broke 4,000. Thanks Indian Twitter! 🇮🇳🇮🇳🇮🇳🌗🌗🌗
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Jonathan O’Callaghan
1 year
Super excited to share this. Astronomers say they may have seen a hint of helium-2 in the early universe using JWST. It could be a first sign of Pop III stars, the first stars in the cosmos. Pretty amazing discovery if true. Words by me @QuantaMagazine
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Jonathan O’Callaghan
5 years
Why is no rover targeting one of these locations? Look at all that water ice. You think this would be the first place we'd land on Mars.
@esa
European Space Agency
5 years
A beautiful #winter wonderland... on #Mars ! This ice-filled crater was imaged by our Mars Express spacecraft. Korolev crater is 82 kilometres across and found in the northern lowlands of Mars. More images:
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Jonathan O’Callaghan
3 years
Lucy JWST Dart JUICE Psyche ExoMars Europa Clipper Dragonfly Comet Interceptor DAVINCI+ VERITAS Space reporters gonna be busy for a while.
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Jonathan O’Callaghan
5 years
Piers Morgan is going to be livid when he finds out that Federer didn't acknowledge every supporter when signing autographs. Just you wait.
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Jonathan O’Callaghan
2 years
NASA and SpaceX are about to launch the two largest rockets in history: SLS and Starship. Now astronomers are dreaming of what science missions these gigantic machines will make possible, from giant telescopes to Pluto orbiters. Words by me @SciAm
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